WO2017113073A1 - Émetteur et récepteur et procédé de traitement de signal - Google Patents

Émetteur et récepteur et procédé de traitement de signal Download PDF

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Publication number
WO2017113073A1
WO2017113073A1 PCT/CN2015/099250 CN2015099250W WO2017113073A1 WO 2017113073 A1 WO2017113073 A1 WO 2017113073A1 CN 2015099250 W CN2015099250 W CN 2015099250W WO 2017113073 A1 WO2017113073 A1 WO 2017113073A1
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Prior art keywords
pam
transmitter
discrete
sequence
frequency
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English (en)
Chinese (zh)
Inventor
曾歆
王宗杰
丁仁天
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2015/099250 priority Critical patent/WO2017113073A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying

Definitions

  • the present invention relates to the field of signal processing technologies, and in particular, to a signal processing method, a transmitter, and a receiver.
  • the existing 4G Long Term Evolution (LTE) physical layer is designed based on Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) technology.
  • CP-OFDM Cyclic Prefix-Orthogonal Frequency Division Multiplexing
  • Each subcarrier is in the frequency domain. It is a sinc function, which causes OFDM to have slower out-of-band attenuation in the frequency domain and higher out-of-band interference. Therefore, the LTE system uses 10% of the system bandwidth as a guard band, so that the LTE system does not cause interference to other out-of-band wireless communication systems.
  • FBMC filter bank multi-carrier
  • OFDM Offset Quadrature Amplitude Modulation
  • the FBMC-OQAM can be simplified by the frequency domain expansion method, as shown in FIG. 1 , which is the working block diagram of the FBMC system in the prior art, and the specific method is as follows: if the total number of symbols to be transmitted is M* K, where d m,k represents the sign of the mth time slot of the kth subcarrier.
  • K pulse amplitude modulated (PAM) symbols ie [d m,0 , d m,1 ,...,d m,K-1 ], these K PAM symbols Mapped to K FBMC subcarriers respectively, for a PAM symbol, the specific operation is as follows, d m, k is multiplied by the phase factor j m + k and then copied M, to form M PAM symbols, each copied The PAM symbols are each multiplied by the frequency domain filter coefficients of the M points to be mapped onto the FBMC subcarriers, and finally the frequency points on each subcarrier are mapped to the M*K/2 point inverse fast Fourier transform (Inverse Fast Fourier) Transmission, IFFT) On the mapping frequency, the IFFT mapping frequency of the M*K/2 point is converted to the time domain by the IFFT transform, so that the M*K/2 point time domain signals are overlapped and sent to the receiver.
  • PAM pulse amplitude modulated
  • the receiver After receiving the signal, the receiver intercepts the M*K/2 point time domain signal by the intercept window, performs Fast Fourier Transmission (FFT), overchannel estimation, channel equalization, frequency domain filtering, and multiplies the phase.
  • FFT Fast Fourier Transmission
  • the factor j - (m + k) takes the real part and finally gets the K point PAM symbol.
  • the embodiment of the invention provides a signal processing method and device.
  • a subcarrier can carry M PAM symbols carrying a useful signal at a time, and the K*M PAM symbols need to be processed only once, which reduces the processing complexity.
  • a first aspect of the present invention provides a signal processing method, including:
  • the transmitter maps the N pulse amplitude modulation (PAM) symbol sequences to be transmitted to K sequence segments, where M is greater than or equal to 2, M is the number of time domain symbols per frame, and K*M is greater than or equal to N ;
  • PAM pulse amplitude modulation
  • the transmitter For each of the sequence segments, the transmitter performs a discrete Fourier transform DFT on the M PAM symbols subjected to the phase mapping process to obtain discrete frequency domain signals corresponding to the K sequence segments;
  • the transmitter converts a frequency point of each of the K subcarriers into a time domain signal and transmits the time domain signal to a receiver. Converting M PAM symbols of each sequence segment into discrete frequency domain signals by discrete Fourier transform, and further mapping the discrete frequency domain signals onto K subcarriers, thereby realizing M segments carrying useful signals of one sequence segment
  • the PAM symbols are modulated onto one subcarrier, and one processing flow can transmit K*M PAM symbols, reducing processing complexity and shortening the duration of transmitting all PAM symbols.
  • the transmitter converts a frequency point of each of the K subcarriers into a time domain signal, including:
  • the transmitter converts the IFFT mapping frequency of each subcarrier mapping into a time domain signal by using an inverse fast Fourier transform. By mapping the frequency points of each subcarrier in the subcarrier to the IFFT mapping frequency point, the subsequent conversion of the time domain signal is facilitated.
  • the transmitter maps the discrete frequency domain signals corresponding to each sequence segment to the corresponding subcarriers, including:
  • the transmitter multiplies the discrete frequency domain signal of each sequence segment by the frequency domain filter coefficient, so as to map the discrete frequency domain signals corresponding to each sequence segment to the corresponding subcarriers, usually one sequence segment corresponds to one subcarrier, one
  • the subcarriers include M frequency points.
  • the frequency domain filter coefficients are used to map the discrete frequency domain signals of the K sequence segments to the K subcarriers, that is, the M PAM symbols of one sequence segment are modulated to the M frequency points of one subcarrier, and the processing is reduced. the complexity.
  • the transmitter will M the PAM symbols in each sequence segment Before performing phase mapping, it also includes:
  • the transmitter precodes the PAM symbols in each sequence segment through a precoding matrix, that is, the PAM symbols of a sequence segment are multiplied by a precoding matrix;
  • the transmitter performs phase mapping of the M PAM symbols in each sequence segment, including:
  • the transmitter performs phase mapping processing on the M PAM symbols that have been precoded in each sequence segment.
  • the PAM symbols of each sequence segment are pre-coded by a precoding matrix, so that the mapping frequency control of the PAM symbols of each sequence segment in the frequency domain is realized.
  • the precoding matrix comprises a unit matrix or a Hadamard code matrix.
  • the precoding matrix is defined as a unit matrix or a Hadard code matrix, and specific control of each frequency point in the frequency domain signal can be realized by transforming the precoding matrix. For example, if it is a unit matrix, it is equivalent to not processing each PAM symbol. Therefore, each frequency point of the frequency domain signal is still in the original state. If it is a Hada code matrix, it is equivalent to controlling the mapping of each PAM symbol to a specific frequency point in the frequency domain signal.
  • the precoding matrix is a Hadam code matrix
  • the M PAM symbols in the pre-coded sequence segment are Each PAM symbol is mapped to at least one frequency point of the discrete frequency domain signal corresponding to the sequence segment after the discrete Fourier transform, that is, the data of the corresponding PAM symbol is carried by the at least one frequency point.
  • the precoding matrix is further defined as a Hadamard code matrix
  • a PAM symbol subjected to precoding is subjected to discrete Fourier transform and mapped to at least one specific frequency point in the discrete frequency domain signal, so as to facilitate the signal carried by each PAM symbol. Control of frequency points mapped in the frequency domain.
  • the target PAM symbol in the M PAM symbols of the sequence segment carries a pilot signal
  • the target PAM symbol passes through the discrete Fu
  • the transform is mapped to the target frequency point in the discrete frequency domain signal corresponding to the sequence segment, that is, the target frequency point carries the data of the target PAM symbol.
  • All PAM symbols except the target PAM symbol in the M PAM symbols of the sequence segment are not mapped to the target frequency point after being subjected to discrete Fourier transform.
  • the pilot signal is added by the target PAM symbol in at least two PAM symbols of the sequence segment, the target PAM symbol is mapped to the target frequency point of the discrete frequency domain signal, and the other PAM symbols are not mapped to the target frequency point, that is, The values of other PAM symbols mapped to the target frequency point are zero, so that the pilot signal is not interfered by other PAM signals, so that the receiving end can accurately perform channel estimation and improve system link performance.
  • the PAM symbol sequence to be sent includes a sequence segment.
  • the M PAM symbols of the sequence segment are mapped to a subcarrier by a discrete Fourier transform discrete frequency domain signal.
  • a single carrier FBMC system can achieve a very low Peak to Average Power Ratio (PAPR), thereby improving edge coverage performance.
  • PAPR Peak to Average Power Ratio
  • a second aspect of the present invention provides a signal processing method, including:
  • the receiver receives the time domain signal sent by the transmitter, and converts the time domain signal into a frequency domain signal by using a fast Fourier transform, where the frequency domain signal includes frequency points of K subcarriers, and each subcarrier includes M frequency points;
  • the receiver performs frequency domain matched filtering on M frequency points of each of the K subcarriers to obtain discrete frequency domain signals corresponding to K sequence segments, and K is the number of sequence segments when the transmitter divides N PAM symbol sequences. ;
  • the receiver performs an inverse discrete Fourier transform IDFT on the M discrete frequency domain signals corresponding to each of the K sequence segments, and obtains discrete time domain signals corresponding to the K sequence segments, and the discrete time of the one sequence segment
  • the domain signal includes M discrete points
  • the receiver performs inverse phase mapping on the discrete time domain signals corresponding to the K sequence segments, the reverse phase mapping is performed according to the phase mapping performed by the transmitter on the M PAM symbols to be transmitted in each of the sequence segments.
  • Reverse phase mapping ;
  • the receiver determines the real part of the discrete time domain signals corresponding to the K sequence segments processed by the reverse phase mapping as the PAM symbols transmitted by the transmitter.
  • the receiver converts multiple frequency points on each subcarrier into discrete time domain signals by discrete Fourier transform, and the PAM symbols can be extracted from the discrete time domain signals. In this way, one subcarrier can be extracted. Multiple PAM symbols carrying useful signals reduce processing complexity.
  • the method further includes:
  • the receiver performs pre-precoding processing on the discrete time domain signal corresponding to each of the K sequence segments processed by the reverse phase mapping;
  • the receiver determines the real part of the discrete time domain signal corresponding to the K sequence segments processed by the reverse phase mapping as the PAM symbol sent by the transmitter, including:
  • the receiver determines the real part of the discrete time domain signals corresponding to the K sequence segments subjected to the de-precoding process and the reverse phase mapping process as the PAM symbols transmitted by the transmitter. If the transmitter performs precoding processing before transmitting the PAM symbol, after the receiver obtains the discrete time domain signal, further de-precoding processing is needed to obtain the PAM symbol transmitted by the transmitter, and the PAM can be controlled by the precoding matrix. The mapped value of the symbol at each frequency point of the discrete frequency domain signal.
  • a third aspect of the present invention provides a transmitter, including:
  • a resource mapping module configured to map the sequence of N PAM symbols to be sent to K sequence segments, where M is greater than or equal to 2, M is the number of time domain symbols per frame, and K*M is greater than or equal to N;
  • phase mapping module configured to perform phase mapping processing on the M PAM symbols in each of the sequence segments, so that K*M PAM symbols are orthogonal in the FBMC system;
  • a DFT module configured to perform discrete Fourier transform on the M PAM symbols subjected to phase mapping processing for each of the sequence segments, to obtain discrete frequency domain signals corresponding to K sequence segments;
  • a frequency domain filtering module configured to map discrete frequency domain signals corresponding to each of the sequence segments to respective Corresponding subcarriers, wherein the discrete frequency domain signals of each sequence segment are mapped to M frequency points of each subcarrier;
  • a conversion module configured to convert a frequency point of each of the K subcarriers into a time domain signal, and send the time domain signal to a receiver. Converting multiple PAM symbols of each sequence segment into discrete frequency domain signals by discrete Fourier transform, and further mapping the discrete frequency domain signals to the frequency points of the K subcarriers, thereby implementing a useful signal for carrying a sequence segment
  • the M PAM symbols are modulated onto one subcarrier, and one processing flow can transmit K*M PAM symbols, reducing processing complexity and shortening the duration of transmitting all PAM symbols.
  • the converting module includes:
  • mapping module configured to map a frequency point of each of the K subcarriers to an inverse fast Fourier transform IFFT mapping frequency point
  • An IFFT module is configured to convert an IFFT mapping frequency point of each of the K subcarriers into a time domain signal by using an inverse fast Fourier transform. By mapping the frequency points of each subcarrier in the subcarrier to the IFFT mapping frequency point, the subsequent conversion of the time domain signal is facilitated.
  • the frequency domain filtering module is specifically configured to multiply the discrete frequency domain signal of each sequence segment by a frequency domain filter coefficient, thereby The discrete frequency domain signals corresponding to the segments are mapped to the frequency points of the respective corresponding subcarriers.
  • one sequence segment corresponds to one subcarrier, and one subcarrier includes M frequency points.
  • the frequency domain filter coefficients are used to map the discrete frequency domain signals of the K sequence segments to the K subcarriers, that is, the M PAM symbols of one sequence segment are modulated to the M frequency points of one subcarrier, and the processing is reduced. the complexity.
  • the transmitter further includes:
  • a precoding module configured to precode the M PAM symbols in each sequence segment by using a precoding matrix, that is, a PAM symbol of a sequence segment is multiplied by a precoding matrix
  • the phase mapping module is specifically configured to perform phase mapping processing on the M PAM symbols that have undergone precoding processing in each sequence segment.
  • the PAM symbols of each sequence segment are pre-coded by a precoding matrix, so that the mapping frequency control of the PAM symbols of each sequence segment in the frequency domain is realized.
  • the precoding matrix comprises a unit matrix or a Hada code matrix.
  • the precoding matrix is defined as a unit matrix or a Hadard code matrix, and specific control of each frequency point in the frequency domain signal can be realized by transforming the precoding matrix. For example, if it is a unit matrix, it is equivalent to not processing each PAM symbol. Therefore, each frequency point of the frequency domain signal is still in the original state. If it is a Hada code matrix, it is equivalent to controlling the mapping of each PAM symbol to a specific frequency point in the frequency domain signal.
  • the precoding matrix is a Hadam code matrix
  • the M segments in the sequence segment after precoding processing Each PAM symbol in the PAM symbol is subjected to discrete Fourier transform and mapped to at least one frequency point of the discrete frequency domain signal corresponding to the sequence segment, that is, the at least one frequency point carries data of the corresponding PAM symbol.
  • the precoding matrix is further defined as a Hadamard code matrix
  • a PAM symbol subjected to precoding is subjected to discrete Fourier transform and mapped to at least one specific frequency point in the discrete frequency domain signal, so as to facilitate the signal carried by each PAM symbol. Control of frequency points mapped in the frequency domain.
  • the target PAM symbol in the M PAM symbols of the sequence segment carries a pilot signal, and the target PAM symbol passes the discrete Fourier Converting to a target frequency point in a discrete frequency domain signal corresponding to the sequence segment;
  • All PAM symbols of the at least two PAM symbols of the sequence segment except the target PAM symbol are not mapped to the target frequency point after undergoing discrete Fourier transform.
  • the pilot signal is added by the target PAM symbol in at least two PAM symbols of the sequence segment, the target PAM symbol is mapped to the target frequency point of the discrete frequency domain signal, and the other PAM symbols are not mapped to the target frequency point, that is, The values of other PAM symbols mapped to the target frequency point are zero, so that the pilot signal is not interfered by other PAM signals, so that the receiving end can accurately perform channel estimation and improve system link performance.
  • the PAM symbol sequence to be sent includes a sequence segment.
  • the M PAM symbols of the sequence segment are mapped to the M frequency points of one subcarrier by the discrete frequency domain signal after the discrete Fourier transform.
  • a single carrier FBMC system can achieve a very low peak-to-average ratio, thereby improving edge coverage performance.
  • a fourth aspect of the present invention provides a receiver, including:
  • FFT module for receiving a time domain signal transmitted by a transmitter and performing FFT by fast Fourier transform Converting the time domain signal into a frequency domain signal, where the frequency domain signal includes frequency points of K subcarriers, each subcarrier includes M frequency points, and the number of K is the number of subcarriers transmitted by the transmitter;
  • the matched filtering module is configured to perform frequency domain matching filtering on M frequency points of each of the K subcarriers in the frequency domain signal to obtain discrete frequency domain signals corresponding to K sequence segments, and K divides N transmitters The number of sequence segments when the PAM symbol is also the number of subcarriers transmitted by the transmitter;
  • the IDFT module is configured to perform an inverse discrete Fourier transform IDFT on the M discrete frequency domain signals corresponding to each of the K sequence segments, to obtain discrete time domain signals corresponding to the K sequence segments;
  • An inverse phase mapping module configured to perform inverse phase mapping on discrete time domain signals corresponding to K sequence segments, where the reverse phase mapping is based on M to transmit PAM symbols in each of the sequence segments Reverse phase mapping by phase mapping performed;
  • a determining module configured to determine a real part of the discrete time domain signals corresponding to the K sequence segments processed by the reverse phase mapping as a PAM symbol sent by the transmitter.
  • the receiver converts multiple frequency points on each subcarrier into discrete time domain signals by discrete Fourier transform, and the PAM symbols can be extracted from the discrete time domain signals. In this way, one subcarrier can be extracted. M PAM symbols carrying useful signals can receive K*M PAM symbols at a time, reducing processing complexity.
  • the receiver further includes:
  • a pre-coding module configured to perform pre-coding processing on the discrete time domain signals corresponding to the K sequence segments processed by the reverse phase mapping
  • the determining module is specifically configured to determine the real part of the discrete time domain signals corresponding to the K sequence segments after the de-precoding process and the reverse phase mapping process as the PAM symbols sent by the transmitter. If the transmitter performs precoding processing before transmitting the PAM symbol, after the receiver obtains the discrete time domain signal, further de-precoding processing is needed to obtain the PAM symbol transmitted by the transmitter, and the PAM can be controlled by the precoding matrix. The mapped value of the symbol at each frequency point of the discrete frequency domain signal.
  • a fifth aspect of the present invention provides a transmitter, including a processor and a transmitter;
  • the processor is configured to map the sequence of N PAM symbols to be sent to K sequence segments, where M is greater than or equal to 2, M is the number of time domain symbols per frame, and K*M is greater than or equal to N;
  • the processor performs phase mapping on M PAM symbols in each sequence segment, so that K*M PAM symbols are orthogonal in the FBMC system;
  • the processor For each sequence segment, the processor performs discrete Fourier transform DFT on the M PAM symbols subjected to phase mapping to obtain discrete frequency domain signals corresponding to K sequence segments;
  • the processor maps the discrete frequency domain signals corresponding to each sequence segment to respective corresponding subcarriers, wherein the discrete frequency domain signals of each sequence segment are mapped to M frequency points of each subcarrier;
  • the processor converts a frequency point of each of the K subcarriers into a time domain signal
  • the transmitter is configured to send the converted time domain signal to a receiver.
  • a sixth aspect of the present invention provides a receiver including a receiver and a processor
  • the receiver is configured to receive a time domain signal sent by the transmitter
  • the processor is configured to convert the time domain signal into a frequency domain signal by using a fast Fourier transform, where the frequency domain signal includes frequency points of K subcarriers, and each subcarrier includes M frequency points;
  • the processor performs frequency domain matched filtering on M frequency points of each of the K subcarriers to obtain discrete frequency domain signals corresponding to K sequence segments, and K is the number of sequence segments when the transmitter divides N PAM symbols. ;
  • the processor performs an inverse discrete Fourier transform (IDFT) on the M discrete frequency domain signals corresponding to each of the K sequence segments, and obtains discrete time domain signals corresponding to the K sequence segments, and the discrete time domain of the one sequence segment
  • IDFT inverse discrete Fourier transform
  • the processor performs inverse phase mapping on the phase mapping of the transmitter for the discrete time domain signals corresponding to the K sequence segments, the reverse phase mapping is based on the M to be sent by the transmitter for each of the sequence segments Reverse phase mapping by phase mapping performed by the PAM symbol;
  • the processor determines the real part of the discrete time domain signals corresponding to the K sequence segments processed by the reverse phase mapping as the PAM symbols transmitted by the transmitter.
  • the transmitter divides the PAM symbol sequence to be transmitted into K sequence segments, each sequence segment includes M PAM symbols, performs phase mapping for M PAM symbols of each sequence segment, and then performs phase mapping.
  • the M PAM symbols are subjected to discrete Fourier transform to obtain discrete frequency domain signals corresponding to K sequence segments, and then the discrete frequency domain signals corresponding to each sequence segment are mapped to respective subcarriers, and finally the respective subcarriers are The frequency point is converted into time domain signal transmission.
  • M PAM symbols carrying a useful signal in one sequence segment can be modulated onto one subcarrier, and K*M PAM symbols can be transmitted in one processing flow, thereby reducing processing complexity. degree.
  • FIG. 1 is a block diagram of an implementation of a FBMC in the prior art according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a signal processing method according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a FBMC transmitter according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a frequency domain map according to an embodiment of the present invention.
  • FIG. 5 is a mapping diagram of orthogonal codes and frequency points according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of pilot insertion according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of FBMC-OQAM single carrier multiple access according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of comparison of PAPR performance of a FBMC-OQAM single carrier according to an embodiment of the present invention.
  • FIG. 9 is a schematic flowchart diagram of another signal processing method according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a FBMC receiver according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of another FBMC transmitter according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of another FBMC receiver according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic diagram of a number of time domain symbols according to an embodiment of the present invention.
  • the transmitter in the embodiment of the present invention may be a terminal or included in the terminal.
  • the transmitter may also be a base station or included in the base station.
  • the transmitter may also be a separate processing chip.
  • the receiver in the embodiment of the present invention may be a terminal or included in the terminal.
  • the receiver may also be a base station or included in the base station.
  • the receiver may also be a separate processing chip.
  • the terminal or the base station includes an encoder, a PAM modulator, a transmitter, a radio frequency circuit, and an antenna; wherein the encoder is connected to the PAM modulator, and the PAM modulator and the transmitter Connected, the transmitter is connected to the RF circuit, and the RF circuit is connected to the antenna.
  • the encoder encodes the bit stream to be transmitted, and sends the encoded bit stream to the PAM modulator for pulse amplitude modulation to obtain a PAM symbol sequence, the PAM symbol sequence includes N PAM symbols, and then sends the PAM symbol sequence into the PAM symbol sequence.
  • the transmitter provided by the embodiment of the invention performs signal processing to obtain a time domain signal, and the time domain signal is modulated by the radio frequency circuit to the antenna for transmission.
  • the terminal or the base station includes: an antenna, a radio frequency circuit, a receiver, a PAM demodulator, and a decoder; wherein the antenna is connected to the radio frequency circuit, and the radio frequency circuit is connected to the receiver.
  • the receiver is connected to the PAM demodulator, and the PAM demodulator is connected to the decoder.
  • the antenna receives the time domain signal, and sends the time domain signal to the radio frequency circuit for low frequency modulation processing.
  • the radio frequency circuit then sends the low frequency modulation processed time domain signal to the receiver provided by the embodiment of the present invention for signal processing to obtain the PAM.
  • the symbol sequence is then sent to the PAM demodulator for demodulation, and finally the demodulated signal is input to the decoder for decoding to obtain a bit stream.
  • FIG. 2 is a schematic flowchart of a signal processing method according to an embodiment of the present invention.
  • the signal processing method in this embodiment may be performed by the transmitter shown in FIG. 3, as shown in the figure, the signal processing in this embodiment.
  • the method includes steps S200-S203;
  • the transmitter maps the N pulse amplitude modulated PAM symbols to be sent to the K sequence segments, where each of the sequence segments includes M PAM symbols, where M is greater than or equal to 2, and M is a time domain of each frame. Number of symbols, K*M is greater than or equal to N;
  • the modulation system performs encoding processing on the bit stream to be transmitted by the encoder, and then performs pulse amplitude modulation on the bit stream after the encoding process by the PAM modulator to obtain N PAM symbols to be transmitted.
  • the transmitter maps the N PAM symbols to be transmitted to K sequence segments, each sequence segment includes M PAM symbols, and M is the number of time domain symbols per frame.
  • M PAM symbols of one sequence segment are transmitted by one subcarrier.
  • FIG. 13 is a schematic diagram of a number of time domain symbols provided by an embodiment of the present invention, As shown in the figure, the horizontal axis represents time and the vertical axis represents the frequency of K subcarriers. For a certain subcarrier, the M PAM symbols on the horizontal axis are the number of time domain symbols per frame.
  • the number of PAM symbols of the last sequence segment may be less than M, that is, N/M is not an integer, optionally, in this case, Zeros can be added to the last sequence segment to make the number of PAM symbols of the last sequence segment also M. If the number of all sequence segments is K, then the final K*M is greater than or equal to N.
  • dm,k represents the mth PAM symbol on the kth subcarrier
  • M PAM symbols on the subcarrier k ie, M PAM symbols in sequence segment k
  • the transmitter performs phase mapping on the M PAM symbols in each of the sequence segments, so that K*M PAM symbols are orthogonal in the FBMC system.
  • the PAM symbols in each sequence segment are subjected to phase mapping processing.
  • the phase mapping processing may be performed on the sequence.
  • Each PAM symbol in the segment is multiplied by a phase factor, or the PAM symbol in the sequence segment is multiplied by a phase mapping matrix.
  • the precoding process may be performed by the precoding module, and then the phase mapping module is input for phase mapping processing, and finally, the phase-mapped PAM symbol input M-DFT module performs an M-point discrete Fourier transform to obtain a discrete frequency domain signal corresponding to the sequence segment.
  • the following describes the process of precoding the M PAM symbols in each sequence segment by the precoding matrix of the precoding module through the transmitter;
  • the transmitter in order to control the mapping frequency of each PAM symbol in the PAM symbol sequence in the frequency domain, the transmitter may also perform a phase mapping process on the M PAM symbols in the sequence segment, and may also use a precoding matrix to sequence Each PAM symbol in the segment is pre-coded.
  • the pre-coding matrix needs to be determined according to a specific application scenario. For example, in order to zero the value of some IFFT mapping frequency points, the pre-coding matrix may be It is a Hadamard matrix.
  • the Hada code matrix is an orthogonal square matrix composed of +1 and -1 elements.
  • the precoding matrix in this embodiment includes, but is not limited to, a Hada code matrix and a unit matrix.
  • the PAM symbol of a sequence segment in this embodiment is processed by a precoding module.
  • each of the M PAM symbols in the sequence segment after the precoding process is discrete.
  • Fourier transforming and mapping to at least one of the discrete frequency domain signals corresponding to the sequence segment that is, mapping at least one of the at least two PAM symbols in the sequence segment to at least one of the discrete frequency domain signals
  • the value of the frequency point is greater than zero (that is, the data of the corresponding PAM symbol is carried by the at least one frequency point), and the values of other frequency points of the PAM symbol mapped to the discrete frequency domain signal are zero.
  • FIG. 5 it is a mapping relationship between a PAM symbol and a discrete frequency domain signal according to an embodiment of the present invention.
  • the first PAM symbol C0 is mapped to a frequency in a discrete frequency domain signal.
  • Point Tap2 the second PAM symbol C1 is mapped to the frequency point Tap6 in the discrete frequency domain signal
  • the third PAM symbol C2 is mapped to the frequency points Tap0 and Tap4 in the discrete frequency domain signal
  • the fourth PAM symbol C3 is mapped to the discrete
  • the fifth PAM symbol C4 is mapped to the frequency points Tap1, Tap3, Tap5, Tap7 in the discrete frequency domain signal, and the other can be queried from FIG.
  • one PAM symbol can be mapped to 1-4 frequency points in the discrete frequency domain signal. It should be noted that the PAM symbol is mapped to one or more frequency points in the discrete frequency domain signal, that is, the one or more frequency points carry the data of the PAM symbol.
  • the transmitter performs phase mapping processing on the pre-coded PAM symbols in each of the sequence segments.
  • the transmitter performs discrete Fourier transform on the M PAM symbols subjected to phase mapping processing for each of the sequence segments, to obtain discrete frequency domain signals corresponding to K sequence segments;
  • the transmitter performs Discrete Fourier Transform (DFT) on all the M PAM symbols subjected to phase mapping in the sequence segment, thereby obtaining the sequence segment.
  • DFT Discrete Fourier Transform
  • the PAM symbol of a sequence segment is represented by a vector.
  • the vector corresponding to the sequence segment is transformed.
  • the PAM symbols of one sequence segment include M, and therefore, when the DFT transform is performed, the M-DFT transform is performed.
  • the M PAM symbols of one sequence segment are converted into discrete frequency domain signals, and the M PAM symbols in one sequence segment are converted and mapped to M of the discrete frequency domain signals corresponding to the sequence segment.
  • the discrete frequency domain signal corresponding to one sequence segment includes M discrete frequency points.
  • the transmitter includes K M-DFT modules, and a PAM symbol of a sequence segment is subjected to discrete Fourier transform by an M-DFT module, thereby obtaining a discrete frequency domain signal corresponding to the sequence segment.
  • the transmitter maps the discrete frequency domain signals corresponding to each of the sequence segments to respective subcarriers, where the discrete frequency domain signals of each sequence segment are mapped to M frequency points of each subcarrier. on;
  • the transmitter maps the discrete frequency domain signals corresponding to each sequence segment to the frequency points of the corresponding subcarriers, wherein the discrete frequency domain signals of one sequence segment are mapped to the M frequency of one subcarrier. Point.
  • the M PAM symbols of the sequence segment are subjected to discrete Fourier transform of the M-DFT module to obtain M discrete frequency points, and then the M is obtained.
  • the point discrete frequency points are mapped to M frequency points of one subcarrier.
  • mapping of the frequency points of the discrete frequency points to the subcarriers may be performed by multiplying the M discrete frequency points corresponding to one sequence segment by the frequency domain filtering coefficients by using a frequency domain filtering module, thereby The discrete frequency points are mapped to M frequency points on one subcarrier. It should be noted that mapping the discrete frequency points to the frequency points of the subcarriers is to modulate the M PAM symbols corresponding to the discrete frequency points onto the subcarriers.
  • mapping the discrete frequency domain signals corresponding to each sequence segment to the subcarriers adopts the foregoing mapping processing manner.
  • the precoding matrix used in the precoding process is a Hadamard code matrix
  • a discrete frequency domain signal corresponding to M sequence segments is mapped to a frequency point of M subcarriers
  • a certain sequence segment is used. Mapping a PAM symbol to one or more frequency points in a discrete frequency domain signal
  • the value of the signal is zero
  • the corresponding frequency of the subcarrier still does not carry the data of the PAM symbol, that is, the PAM symbol is mapped to the corresponding frequency of the subcarrier.
  • the mapped value is still zero.
  • the M PAM symbols on the subcarrier k are marked as The M PAM symbols are respectively subjected to precoding, phase mapping, M-point DFT and M-point frequency domain filters, and can be expressed as:
  • variable list is as follows:
  • -x is a vector of M rows and 1 column, that is, M frequency points on subcarrier k;
  • -P k is a precoding matrix. It can be a unit matrix when transmitting general data, and an M point Hadam code matrix can be used when transmitting special symbols such as pilots, as the case may be.
  • ⁇ k diag[j 0+k-1 ,j 1+k-1 ,...,j M- 1+k-1 ].
  • -F M is an M-point DFT matrix
  • G -G diag[G 0 , G 1 , ..., G M-1 ], where G m is the filter frequency domain coefficient.
  • the transmitter converts a frequency point of each of the K subcarriers into a time domain signal, and sends the time domain signal to a receiver.
  • the transmitter converts the frequency point of each of the K subcarriers into a time domain signal, and transmits the converted time domain signal to the receiver.
  • a Cyclic Prefix CP needs to be added before the time domain signal is sent.
  • the step of the transmitter converting the frequency point of the subcarrier into the time domain signal may include the following steps S20-S21;
  • the transmitter maps a frequency point of each of the K subcarriers to an inverse fast Fourier transform IFFT mapping frequency point.
  • the transmitter maps the frequency points of each subcarrier to an Inverse Fast Fourier Transform (IFFT) mapping frequency point.
  • IFFT Inverse Fast Fourier Transform
  • FIG. 4 the present invention is A mapping diagram is provided in the embodiment, and each of the subcarriers includes M frequency points.
  • each subcarrier includes a center frequency point.
  • the center frequency of subcarrier k-1 is (k-1) M/2
  • the center frequency of subcarrier k is kM/. 2.
  • the number of frequency points mapped to the IFFT of each subcarrier is still 8, for example, subcarrier k, and its first IFFT mapping frequency is (k-1) M/2.
  • the precoding matrix used in the precoding process is a Hadamard code matrix
  • a frequency point of each subcarrier is mapped to an IFFT mapping frequency point
  • a PAM symbol is mapped to one subcarrier. If the mapping value of one or more frequency points is zero, when the frequency of the subcarrier is mapped to the IFFT mapping frequency point, the IFFT mapping frequency point corresponding to one or more frequency points of the subcarrier still does not carry the PAM.
  • the data of the symbol that is, the mapped value of the PAM symbol mapped to the IFFT mapping frequency point is still zero.
  • the PAM symbol is mapped to a value of zero at a specific frequency point, and a pilot signal is added at a specific frequency point.
  • the pilot signal In a multi-carrier FBMC system, due to the data leakage of the PAM symbol carrying the data signal, the pilot signal usually has an inherent interference of the imaginary part.
  • an auxiliary pilot is usually used to interfere with the imaginary part of the pilot. Auxiliary pilots usually require more time-frequency resources or power overhead.
  • the target PAM symbol is mapped to the target frequency point in the discrete frequency domain signal corresponding to the sequence segment by the DFT change, that is, the target frequency point carries the target PAM symbol guide.
  • other PAM symbols are not mapped to the target frequency point, that is, data that the target frequency point does not carry other PAM symbols.
  • the target frequency point is only one of the target PAM symbols mapped to at least one of the discrete frequency domain signals.
  • the value of the specific frequency point can be completely made zero.
  • the preferred scheme given in this embodiment is to prohibit the transmission using the second and third PAM symbols.
  • the data that is, the data is not transmitted on the code channels corresponding to the two PAM symbols, the value of the frequency point Tap4 is 0. If the carrying pilot signal is inserted at the frequency Tap4, the pilot is not affected by any other data symbols, and the frequency domain channel can be perfectly estimated. As shown in FIG. 6, it is a schematic diagram of inserting a pilot signal on the fifth code channel Tap4 of the subcarrier k.
  • the FBMC subcarriers can also be divided into two types, one is a pure data subcarrier (Class I), that is, the M PAM symbols on the subcarrier are data, and the other is The pilot carrier (Class II) is embedded, that is, the symbol carrying the pilot signal exists in the M PAM symbols on the subcarrier.
  • Class I pure data subcarrier
  • Class II The pilot carrier
  • the precoding matrix is a unit matrix
  • the precoding matrix of the class II subcarrier is an M point Hadam code matrix.
  • the transmitter converts an IFFT mapping frequency point of each of the subcarrier mappings into a time domain signal by using an inverse fast Fourier transform.
  • the IFFT frequency of each subcarrier mapping may be converted from the frequency domain by Fast Fourier Transform (FFT). For the time domain signal.
  • FFT Fast Fourier Transform
  • the transmitter needs to process all KM PAM symbols to complete the number of multiplications:
  • the complexity of the signal processing method used in the prior art is the complexity of the signal processing method adopted in this embodiment. Times.
  • the PAM symbol sequence to be transmitted includes a sequence segment, where the sequence segment A discrete frequency domain signal with a PAM symbol after discrete Fourier transform is mapped to M frequency points of one subcarrier.
  • the PAM symbol to be transmitted includes a sequence segment
  • all the PAM symbols of the sequence segment are mapped to the M frequency points of one subcarrier through the DFT discrete frequency domain signal, so this scenario is also called Single carrier FBMC-OQAM
  • single carrier FBMC-OQAM has the characteristics of Peak to Average Power Ratio (PAPR).
  • PAPR Peak to Average Power Ratio
  • a single carrier FBMC-OQAM transmission mode can be used, for example, in a scenario such as a narrowband IoT transmission or a millimeter wave band, which can be used as an upstream waveform.
  • narrowband IoT transmission when users can use 8 IFFT frequency points to transmit, P k selects the unit matrix, and maps 8 PAM symbols on subcarrier k. The other subcarriers do not send data, and the transmitted signal of the user will be obtained. Very low PAPR for coverage enhancement.
  • FIG. 7 it is a single carrier FBMC-OQAM transmission mode provided by an embodiment of the present invention, and a PAM symbol of a terminal UE is transmitted by using one subcarrier.
  • the receiver receives signals of a plurality of users, it corresponds to a plurality of orthogonal subcarriers in the multi-carrier FBMC system, and may be demodulated separately.
  • a single-carrier OQAM (SC-OQAM) modulation and an existing Long Term Evolution Up Link (LTE) are used in the FBMC system according to an embodiment of the present invention.
  • -UL A comparative diagram of a complementary cumulative distribution function (CCDF) in modulation, which is a concept introduced to represent the statistical properties of the Peak to Average Power Ratio (PAPR) in an OFDM system. It is defined as the probability that the peak mean value in a multi-carrier transmission system exceeds a certain threshold z.
  • CCDF complementary cumulative distribution function
  • the PAPR using the single carrier FBMC-OQAM is 3-5 dB lower than the PAPR of the LTE uplink waveform, which improves the maximum transmit power and thus improves the edge coverage performance.
  • the transmitter divides the PAM symbol sequence to be transmitted into K sequence segments, each sequence segment includes M PAM symbols, performs phase mapping for M PAM symbols of each sequence segment, and then performs phase mapping.
  • the M PAM symbols are subjected to discrete Fourier transform to obtain discrete frequency domain signals corresponding to K sequence segments, and then the discrete frequency domain signals corresponding to each sequence segment are mapped to respective subcarriers, and finally the respective subcarriers are
  • the frequency point is converted into time domain signal transmission, which can modulate M PAM symbols carrying a useful signal into one subcarrier on one subsequence.
  • the secondary processing flow can send K*M PAM symbols to reduce processing complexity.
  • FIG. 9 is a schematic flowchart of another signal processing method according to an embodiment of the present invention.
  • the signal processing method in this embodiment is mainly performed by the receiver in FIG. 10.
  • the signal processing method in this embodiment includes :
  • the receiver receives a time domain signal sent by the transmitter, and converts the time domain signal into a frequency domain signal by using a fast Fourier transform, where the frequency domain signal includes frequency points of K subcarriers, each of the sub The carrier includes M frequency points;
  • a transmission time interval includes MK/2 samples, so after receiving the time domain signal sent by the transmitter, the receiver performs FFT on the MK/2 samples.
  • the FFT transform converts the time domain signal into a frequency domain signal comprising MK/2 IFFT mapped frequency points.
  • the MK/2 IFFT mapping frequency points include frequency points of K subcarriers, and each subcarrier includes M frequency points, wherein there is a specific frequency between each frequency point of each subcarrier and each IFFT mapping frequency point.
  • the mapping relationship that is, the overlapping of the frequency points of the respective subcarriers forms an IFFT frequency point.
  • the receiver extracts frequency points of K subcarriers from a plurality of IFFT mapping frequency points according to a frequency point mapping rule of the transmitter, wherein each subcarrier includes M frequency points.
  • the CP is removed, and then the FFT is performed. After the FFT transform, channel estimation and channel equalization are further performed.
  • S901 The receiver performs frequency domain matched filtering on M frequency points of each of the K subcarriers to obtain a discrete frequency domain signal corresponding to K sequence segments, where K is a PAM for the transmitter. The number of sequence segments at the time of the symbol sequence;
  • the relevant M frequency points are taken out (the frequency point position may refer to the transmitting end IFFT mapping rule), and then multiplied by the frequency matching filter coefficient of the M point, A discrete frequency domain signal corresponding to the sequence segment of the subcarrier is obtained, and the discrete frequency domain signal also includes M frequency points.
  • the receiver performs an inverse discrete Fourier transform IDFT on the M discrete frequency domain signals corresponding to each of the K sequence segments, to obtain discrete time domain signals corresponding to the K sequence segments;
  • the receiver performs Inverse Discrete Fourier Transform (IDFT) on the M frequency points in the discrete frequency domain signals of each of the obtained K sequence segments to obtain discrete time
  • IDFT Inverse Discrete Fourier Transform
  • the M-IDFT module performs IDFT conversion on the output signal of the matched filter module.
  • the receiver performs inverse phase mapping on a phase map of the transmitter for the discrete time domain signals corresponding to the K sequence segments, where the phase mapping of the transmitter is in each of the sequence segments.
  • the reverse phase mapping process is performed by multiplying the reverse phase factor by the reverse phase mapping module.
  • the receiver determines, as the PAM symbol sent by the transmitter, the real part of the discrete time domain signals corresponding to the K sequence segments processed by the reverse phase mapping.
  • the discrete time domain signals corresponding to the respective sequence segments in the K sequence segments subjected to the reverse phase mapping process are composed of complex numbers, and the receivers are discrete from the K sequence segments after performing reverse phase mapping processing.
  • the real part is extracted from the time domain signal and the real part is determined as the PAM symbol transmitted by the transmitter.
  • the receiver determines, in the reverse phase mapping processing, the real part of the discrete time domain signals corresponding to the K sequence segments as the Before the PAM symbol sent by the transmitter, it also includes:
  • the receiver performs pre-precoding processing on the discrete time domain signals corresponding to the K sequence segments after the reverse phase mapping process;
  • the transmitter performs precoding processing before transmitting the PAM symbol
  • the receiver performs reverse phase mapping processing on the discrete time domain signal
  • further de-precoding processing is required, and finally, the pre-preprocessing is performed.
  • the real number is extracted from the discrete time domain signal after the encoding process and the reverse phase mapping process.
  • the entire processing flow for the subcarrier k receiver is: taking the relevant M points after the channel equalization, multiplying the frequency domain matching filter coefficient of the M point, the M point IDFT, and Multiply the inverse phase factor ⁇ H to solve the pre-encoding process to obtain the M-point complex signal, and obtain the real part to obtain Estimated value at the receiving end
  • y m,k is the estimated value of d m,k .
  • the M frequency points corresponding to the subcarriers Transform into The process can be expressed as:
  • a H represents the conjugate transpose of the matrix A. It should be noted that, except for the filter coefficient matrix G, the other matrices are conjugate transposed.
  • the receiver receives the time domain signal sent by the transmitter, and converts the time domain signal into a frequency domain signal by using an FFT transform, where the frequency domain signal includes frequency points of K subcarriers, and each subcarrier includes M frequency points.
  • Frequency domain matching filtering is performed on M frequency points of each subcarrier, and discrete frequency domain signals corresponding to K sequence segments are obtained, and M discrete frequency domain signals corresponding to each sequence segment are IDFT changed to obtain K sequence segments.
  • Corresponding discrete time domain signals are then subjected to inverse phase mapping processing on the discrete time domain signals, and the real part in the discrete time domain signals corresponding to the K sequence segments processed by the reverse phase mapping is determined as the PAM symbol transmitted by the transmitter. .
  • M PAM symbols carrying useful signals can be extracted on one subcarrier, that is, K*M PAM symbols can be extracted in one process, and the processing complexity of the receiver is reduced.
  • FIG. 3 is a schematic structural diagram of a transmitter according to an embodiment of the present invention. As shown in the figure, the transmitter of the embodiment includes:
  • the resource mapping module 100 is configured to map the N pulse amplitude modulated PAM symbols to be sent to the K sequence segments, each of the sequence segments includes M PAM symbols, where M is greater than or equal to 2, and M is each frame. Number of time domain symbols, K*M is greater than or equal to N;
  • the modulation system performs encoding processing on the bit stream to be transmitted by using an encoder, and then performs pulse amplitude modulation on the encoded bit stream through the PAM modulator to obtain N PAM symbols to be transmitted.
  • the transmitter maps the N PAM symbols to be sent to the K sequence segments, and usually the PAM symbols of one sequence segment are sent by one subcarrier.
  • N PAM symbols there may be a number of PAM symbols in the last sequence segment that is less than M, that is, N/M is not an integer, optionally, in this case, at the most Zero is added to the subsequent sequence segment to make the number of PAM symbols of the last sequence segment also M. If the number of all sequence segments is K, then the final K*M is greater than or equal to N.
  • the phase mapping module 102 is configured to perform phase mapping processing on the M PAM symbols in each of the sequence segments, so that K*M PAM symbols are orthogonal in the FBMC system;
  • the PAM symbols in the pre-coded sequence segment are subjected to phase mapping processing.
  • the transmitter further includes a precoding module 101;
  • the precoding module 101 is configured to perform precoding processing on the M PAM symbols in the sequence segment by using a precoding matrix
  • the shooter may perform pre-coding processing on each PAM symbol in the sequence segment by using a pre-coding matrix.
  • the coding matrix needs to be determined according to a specific application scenario.
  • the precoding matrix may be a Hadamard code matrix. It should be noted that the precoding matrix in this embodiment includes, but is not limited to, a Hada code matrix and a unit matrix.
  • the DFT module 103 is configured to perform discrete Fourier transform on the M PAM symbols subjected to phase mapping processing for each of the sequence segments, to obtain discrete frequency domain signals corresponding to K sequence segments;
  • the M PAM symbols of one sequence segment are converted into discrete frequency domain signals, and the M PAM symbols in one sequence segment are converted and mapped to the discrete frequency domain signals corresponding to the sequence segment.
  • M frequency points are generated by the M-DFT transform.
  • the frequency domain filtering module 104 is configured to map the discrete frequency domain signals corresponding to each of the sequence segments to respective subcarriers, wherein the discrete frequency domain signals of each sequence segment are mapped to M of each subcarrier.
  • mapping the discrete frequency points to the frequency points of the subcarriers is to modulate the M PAM symbols corresponding to the discrete frequency points onto the subcarriers.
  • the frequency domain filtering module 104 is specifically configured to map the discrete frequency domain signals corresponding to each of the sequence segments to frequency points of respective corresponding subcarriers by using frequency domain filter coefficients.
  • the converting module 105 is configured to convert a frequency point of each of the K subcarriers into a time domain signal, and send the time domain signal to a receiver.
  • a cyclic prefix CP needs to be added before the time domain signal is sent.
  • the conversion module may include a mapping module and an IFFT module
  • mapping module configured to map a frequency point of each of the K subcarriers to an inverse fast Fourier transform IFFT mapping frequency point
  • An IFFT module is configured to convert an IFFT mapping frequency point of each of the K subcarriers into a time domain signal by using an inverse fast Fourier transform.
  • the transmitter 1000 includes a processor 1010 and a transmitter 1020.
  • the processor 1010 is configured to map the N PAM symbols to be sent to the K sequence segments, where each of the sequence segments includes M PAM symbols, where M is greater than or equal to 2, and M is the time of each frame. Number of domain symbols, K*M is greater than or equal to N;
  • the processor 1010 is further configured to perform phase mapping processing on the M PAM symbols in each of the sequence segments, so that K*M PAM symbols are orthogonal in the FBMC system;
  • the processor 1010 is further configured to perform discrete Fourier transform on the M PAM symbols subjected to phase mapping processing for each of the sequence segments, to obtain discrete frequency domain signals corresponding to K sequence segments;
  • the processor 1010 is further configured to map the discrete frequency domain signals corresponding to each of the sequence segments to respective corresponding subcarriers, where the discrete frequency domain signals of each sequence segment are mapped to M of each subcarrier.
  • the processor 1010 is further configured to convert a frequency point of each of the K subcarriers into a time domain signal.
  • the transmitter 1020 is configured to send the time domain signal to a receiver.
  • the foregoing converting the frequency point of each of the K subcarriers into a time domain signal includes:
  • the processor 1010 maps a frequency point of each of the K subcarriers to an inverse fast Fourier transform IFFT mapping frequency point;
  • the processor 1010 converts an IFFT mapping frequency point of each of the K subcarriers into a time domain signal by using an inverse fast Fourier transform.
  • the discrete frequency domain signals corresponding to each of the sequence segments are mapped to corresponding ones.
  • the subcarrier including:
  • the processor 1010 maps the discrete frequency domain signals corresponding to each of the sequence segments to respective subcarriers by using frequency domain filter coefficients.
  • the processor 1010 is further configured to perform precoding processing on the M PAM symbols in each of the sequence segments by using a precoding matrix
  • the precoding matrix comprises a unit matrix or a Hada code matrix.
  • the processor 1010 is further configured to perform phase mapping processing on the PAM symbols in the sequence segment after performing precoding processing;
  • Performing a discrete Fourier transform on all the PAM symbols in the sequence segment to obtain a discrete frequency domain signal corresponding to the sequence segment including:
  • the processor 1010 performs discrete Fourier transform on all PAM symbols in the sequence segment after the phase mapping process and the pre-coding process to obtain a discrete frequency domain signal corresponding to the sequence segment.
  • each of the M PAM symbols in the precoded sequence segment is subjected to discrete Fourier transform and mapped to the sequence. At least one of the discrete frequency domain signals corresponding to the segment.
  • the target PAM symbol in the M PAM symbols of the sequence segment carries a pilot signal, and the target PAM symbol is mapped to a target frequency in the discrete frequency domain signal corresponding to the sequence segment after discrete Fourier transform. point;
  • All PAM symbols of the M PAM symbols of the sequence segment except the target PAM symbol are not mapped to the target frequency point after being subjected to discrete Fourier transform.
  • the PAM symbol sequence to be transmitted includes a sequence segment, and the M PAM symbols of the sequence segment are subjected to discrete Fourier The leaf transformed discrete frequency domain signal is mapped to a plurality of frequency points of one subcarrier.
  • the transmitter divides the PAM symbol sequence to be transmitted into K sequence segments, each sequence segment includes M PAM symbols, performs phase mapping for M PAM symbols of each sequence segment, and then performs phase mapping.
  • the M PAM symbols are subjected to discrete Fourier transform to obtain discrete frequency domain signals corresponding to K sequence segments, and then the discrete frequency domain signals corresponding to each sequence segment are mapped to respective subcarriers, and finally the respective subcarriers are Frequency conversion to time domain signaling, this way
  • K*M PAM symbols can be transmitted in one processing flow, which reduces processing complexity.
  • FIG. 10 is a schematic structural diagram of a receiver according to an embodiment of the present invention. As shown in the figure, the receiver of this embodiment includes:
  • the FFT module 200 is configured to receive a time domain signal sent by the transmitter, and convert the time domain signal into a frequency domain signal by using a fast Fourier transform FFT, where the frequency domain signal includes frequency points of K subcarriers, each The subcarrier includes M frequency points;
  • the receiver after receiving the time domain signal sent by the transmitter, performs FFT on the MK/2 samples, and converts the time domain signal into a frequency domain signal by using an FFT transform, where the frequency domain signal includes MK/2
  • the IFFT maps the frequency points.
  • the MK/2 IFFT mapping frequency points include the frequency points of the K subcarriers, and the frequency points of the respective subcarriers overlap and add.
  • the matched filtering module 201 is configured to perform frequency domain matching filtering on M frequency points of each of the K subcarriers to obtain a discrete frequency domain signal corresponding to K sequence segments, where K is a division of the transmitter. Number of sequence segments when N PAM symbols;
  • the receiver obtains the relevant M frequency points after the channel equalization processing (the frequency point position can refer to the IFFT mapping rule of the transmitting end), and multiplies the frequency domain matching filter coefficient of the M point to obtain the sequence segment. Corresponding discrete frequency domain signals.
  • the IDFT module 202 is configured to perform an inverse discrete Fourier transform IDFT on the M discrete frequency domain signals corresponding to each of the K sequence segments, to obtain discrete time domain signals corresponding to the K sequence segments;
  • the receiver performs an inverse discrete Fourier transform (IDFT) on the plurality of frequency points of each of the extracted at least one subcarrier to obtain a discrete time domain signal, where the discrete time domain signal is composed of a complex number.
  • IDFT inverse discrete Fourier transform
  • the reverse phase mapping module 203 is configured to perform inverse phase mapping processing on the M-IDFT processed discrete time domain signal, for example, multiplying by a reverse phase factor;
  • the receiver further includes a deprecoding module 204;
  • the pre-coding module 204 is configured to perform pre-precoding processing on the discrete time domain signals corresponding to the K sequence segments after the reverse phase mapping process;
  • the determining module 205 is configured to determine, as the PAM symbol sent by the transmitter, the real part of the discrete time domain signals corresponding to the K sequence segments after the de-precoding process and the reverse phase mapping process.
  • the receiver further performs parallel-to-serial conversion on the extracted PAM symbols through the parallel-to-serial conversion module P/S to obtain a final PAM symbol.
  • FIG. 12 it is a schematic block diagram of another receiver provided by the embodiment of the present invention.
  • the receiver 2000 includes a processor 2010 and a receiver 2020.
  • the receiver 2020 is configured to receive a time domain signal sent by a transmitter.
  • the processor 2010 is configured to convert the time domain signal into a frequency domain signal by using a fast Fourier transform FFT, where the frequency domain signal includes frequency points of K subcarriers, and each of the subcarriers includes M frequency bands point;
  • the processor 2010 is further configured to perform frequency domain matched filtering on M frequency points of each of the K subcarriers, to obtain discrete frequency domain signals corresponding to K sequence segments, where K is the transmitter The number of sequence segments when dividing N PAM symbol sequences;
  • the processor 2010 is further configured to perform an inverse discrete Fourier transform IDFT on the M discrete frequency domain signals corresponding to each of the K sequence segments, to obtain discrete time domain signals corresponding to the K sequence segments. Performing a reverse phase mapping for the phase mapping of the transmitter for the discrete time domain signals corresponding to the K sequence segments, the phase mapping of the transmitter is to send M of each of the sequence segments to be transmitted PAM symbol for phase mapping;
  • the processor 2010 is further configured to determine, as the PAM symbol sent by the transmitter, the real part of the discrete time domain signals corresponding to the K sequence segments processed by the reverse phase mapping.
  • the processor 2010 is further configured to perform pre-precoding processing on the discrete time domain signals corresponding to the K sequence segments after the reverse phase mapping process;
  • the processor 2010 is further configured to determine, as the PAM symbol sent by the transmitter, the real part of the discrete time domain signals corresponding to the K sequence segments after the de-precoding process and the reverse phase mapping process.
  • the receiver receives the time domain signal sent by the transmitter, and converts the time domain signal into a frequency domain signal by using an FFT transform, where the frequency domain signal includes frequency points of K subcarriers, and each subcarrier includes M frequency points.
  • Frequency domain matching filtering is performed on M frequency points of each subcarrier, and discrete frequency domain signals corresponding to K sequence segments are obtained, and M discrete frequency domain signals corresponding to each sequence segment are IDFT changed to obtain K sequence segments.
  • Corresponding discrete time domain signals are then subjected to inverse phase mapping processing on the discrete time domain signals, and the real part in the discrete time domain signals corresponding to the K sequence segments processed by the reverse phase mapping is determined as the PAM symbol transmitted by the transmitter. .
  • M PAM symbols carrying useful signals can be extracted on one subcarrier, that is, K*M PAM symbols can be extracted in one process, and the processing complexity of the receiver is reduced.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).
  • the modules in the transmitter and the receiver can be combined, divided, and deleted according to actual needs.
  • the components of the microcontroller and the like may be implemented by a general-purpose integrated circuit, such as a central processing unit (CPU), or an application specific integrated circuit (ASIC).
  • a general-purpose integrated circuit such as a central processing unit (CPU), or an application specific integrated circuit (ASIC).

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Abstract

L'invention concerne un procédé de traitement de signal, un émetteur et un récepteur, ledit procédé de traitement de signal comprenant les opérations suivantes : un émetteur divise une séquence de signes PAM à émettre en un nombre K de segments de séquence, chaque segment de séquence comprenant un nombre M de signes PAM ; l'émetteur réalise un mappage de phase sur le nombre M de signes PAM dans chaque segment de séquence ; pour chaque segment de séquence, l'émetteur réalise une transformation de Fourier discrète (DFT) sur le nombre M de signes PAM dans ledit segment de séquence qui ont été soumis à un traitement de mappage de phase, de façon à obtenir des signaux de domaine fréquentiel discrets correspondant au nombre K de segments de séquence ; l'émetteur mappe les signaux de domaine fréquentiel discrets correspondant à chaque segment de séquence au nombre K de sous-porteuses ; l'émetteur convertit un point de fréquence de chaque sous-porteuse parmi le nombre K de sous-porteuses en un signal de domaine temporel, et émet ledit signal de domaine temporel à destination du récepteur. Selon la présente invention, une sous-porteuse peut transporter un nombre M de signes PAM qui transportent des signaux utiles, permettant ainsi de réduire la complexité de traitement lors de l'émission d'un nombre M*K de signes PAM.
PCT/CN2015/099250 2015-12-28 2015-12-28 Émetteur et récepteur et procédé de traitement de signal Ceased WO2017113073A1 (fr)

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CN101867547A (zh) * 2010-05-24 2010-10-20 北京科技大学 一种降低滤波器组多载波系统的峰均比的方法
US20140348268A1 (en) * 2012-01-13 2014-11-27 Orange Method, devices and computer program product for modulation and demodulation delivering ofdm/oqam symbols
CN104981022A (zh) * 2014-04-04 2015-10-14 北京三星通信技术研究有限公司 数据传输的方法、基站及终端
CN104954300A (zh) * 2015-07-16 2015-09-30 电子科技大学 基于辅助导频的滤波器组多载波系统信道估计方法

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WO2022262575A1 (fr) * 2021-06-18 2022-12-22 华为技术有限公司 Procédé et appareil de transmission de signal
WO2024169581A1 (fr) * 2023-02-16 2024-08-22 华为技术有限公司 Procédé et appareil d'envoi de signal
WO2025162184A1 (fr) * 2024-02-04 2025-08-07 华为技术有限公司 Procédé et appareil de communication

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